. * * To disable strict typing, comment out the directive below. */ declare(strict_types=1); class LuhnTest extends PHPUnit\Framework\TestCase { public static function setUpBeforeClass(): void { require_once 'Luhn.php'; } public function testSingleDigitInvalid(): void { $this->assertFalse(isValid("1")); } public function testSingleZeroInvalid(): void { $this->assertFalse(isValid("0")); } public function testSimpleValidNumber(): void { $this->assertTrue(isValid("59")); } public function testSpaceHandling(): void { $this->assertTrue(isValid(" 5 9 ")); } public function testValidCanadianSocialInsuranceNumber(): void { $this->assertTrue(isValid("046 454 286")); } public function testInvalidCanadianSocialInsuranceNumber(): void { $this->assertFalse(isValid("046 454 287")); } public function testInvalidCreditCard(): void { $this->assertFalse(isValid("8273 1232 7352 0569")); } public function testNonDigitCharacterInValidStringInvalidatesTheString(): void { $this->assertFalse(isValid("046a 454 286")); } public function testThatStringContainingSymbolsIsInvalid(): void { $this->assertFalse(isValid("055£ 444$ 285")); } public function testThatStringContainingPunctuationIsInvalid(): void { $this->assertFalse(isValid("055-444-285")); } public function testSpaceAndSingleZeroIsInvalid(): void { $this->assertFalse(isValid(" 0")); } public function testMultipleZerosIsValid(): void { $this->assertTrue(isValid(" 00000")); } public function testThatDoublingNineIsHandledCorrectly(): void { $this->assertTrue(isValid("091")); } public function testThatStringContainingSymbolsWhichCouldBeZeroIsInvalid(): void { $this->assertFalse(isValid(" ABCDEF")); } }